/Engine/Source/Developer/TraceServices/Public/TraceServices/Model/Frames.h
Gets the index of the first frame with start time <= specified time, for the specified frame type. Note: This function does not check the end time of frames.
index of the first frame with start time <= time; also returns 0 when time < start time of the first frame or if frame count is zero
uint32 GetFrameNumberForTimestamp ( ETraceFrameType FrameType, double Time ) const